Total body water percentage and 3rd space water are novel risk factors for training-related lower extremity muscle injuries in young males.

Purpose: To identify the risk factors for training-related lower extremity muscle injuries in young males by a non-invasive method of body composition analysis.

Methods: A total of 282 healthy young male volunteers aged 18 - 20 years participated in this cohort study. Injury location, degree, and injury rate were adjusted by a questionnaire based on the overuse injury assessment methods used in epidemiological studies of sports injuries.